EP0952895B1 - Dispositif de triage - Google Patents

Dispositif de triage Download PDF

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Publication number
EP0952895B1
EP0952895B1 EP98900483A EP98900483A EP0952895B1 EP 0952895 B1 EP0952895 B1 EP 0952895B1 EP 98900483 A EP98900483 A EP 98900483A EP 98900483 A EP98900483 A EP 98900483A EP 0952895 B1 EP0952895 B1 EP 0952895B1
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EP
European Patent Office
Prior art keywords
products
sorting apparatus
stream
transport device
detection system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98900483A
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German (de)
English (en)
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EP0952895A1 (fr
Inventor
Marc Ruymen
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Best NV
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Individual
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/363—Sorting apparatus characterised by the means used for distribution by means of air
    • B07C5/367—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means
    • B07C5/368—Sorting apparatus characterised by the means used for distribution by means of air using a plurality of separation means actuated independently

Definitions

  • the invention concerns a sorting apparatus for granular products, such as peas, nuts, raisins and suchlike, with a detection system, a removal system and a transport device, where said transport device is characterised by a sloping distribution surface over which said products are moved.
  • Canadian patent 1 158 748 describes a sorting apparatus for radioactive ores, in which said ores are moved over a curved plate.
  • Said plate is equipped with channels through which the ores are guided towards a detection system.
  • Said channels ensure that the ores do not move across the width of the plate, so preventing them falling outside the range of the detector.
  • the use of such channels has the disadvantageous consequence that only a limited capacity or flow rate of products to be sorted can be handled.
  • the construction of a plate with several channels extending alongside each other is complex and expensive, due to the plate being curved.
  • the shape of said curved plate is such that, in order to permit detection, it is also necessary to carry out a speed measurement or separate determination of the position of the products to be sorted, with the help of extra sensors, which increases the complexity of the apparatus and the risk of inaccuracies in its operation.
  • the invention intends to overcome this and other disadvantages, by proposing a transport device which enables substantially all low -quality products and foreign bodies to be removed from the product stream in an efficient, fast and extremely accurate way, so that a high- quality product is obtained, with the loss of good products being minimal.
  • a transport device which enables substantially all low -quality products and foreign bodies to be removed from the product stream in an efficient, fast and extremely accurate way, so that a high- quality product is obtained, with the loss of good products being minimal.
  • said surface is convex over at least a certain distance, according to the direction of travel of said products, such that said surface has a curvature in the direction of fall of the products concerned, where said curvature is slightly smaller than that of the path which the products should follow at said surface, in free fall, independently of the surface.
  • said curved surface has a decreasing curvature in the downwards direction.
  • the apparatus has means for adjusting the curvature of said curved surface to match the type of aforementioned products.
  • said surface is a curved plate.
  • the invention also concerns the transport device itself, which can possibly be used in other applications.
  • products which, for example, have to be sorted in order to remove low-quality products or foreign bodies, are routed over a straight, downward-sloping plate.
  • a detection system that comprises, among other things, a camera, and subsequently a removal system, for example a compressed air device.
  • the compressed air device is equipped with compressed air valves with corresponding nozzles, which enable a product or foreign body to be blown out of the product stream whenever such a valve is opened. It is therefore important to know the correct position and speed of each product whenever it passes through the zone where the detection system detects it, so that the correct time and correct position can be determined when a product being examined is located at the aforementioned nozzles in order for it to be possibly removed.
  • the sorting apparatus comprises, as shown in fig. 1, in addition to a detection system 3, a compressed air device 4 with a series of valves with nozzles 4' and a transport device 1 supplied from a so-called vibrating table 2 on which granular products, such as, for example, peas, nuts or raisins, are carried along. These products are routed by the vibrating table 2 to the transport device 1 with a downward sloping surface 1', on which they come up with a speed having a certain horizontal component.
  • the surface 1' is completely smooth, without any channels or grooves in the direction of travel of the products to be sorted. Because of the special shape of the surface 1', the products to be sorted travel substantially according to paths in substantially the same way as would be the case if surface 1' were to be subdivided into channels parallel with each other.
  • Said transport device 1 ensures that the products are routed opposite the detection system 3 and the compressed air device 4, said compressed air device being located lower down. In order to permit effective interaction between said detection system 3 and the compressed air device 4, it has been determined that it is necessary for said products to move along a known path with a known speed curve opposite both of said devices 3 and 4.
  • the time interval, necessary for the products to travel between the zone in which they are detected by the detection system 3 and the zone opposite the aforementioned nozzles 4', should preferably be substantially constant.
  • the distance in the direction of movement 10 of the products between the detection system 3 and the compressed air device 4 is generally between 20 and 150 mm, and should preferably be approximately 70 mm.
  • the detection system 3 can possibly also interact with a reference device 6, generating one or more laser beam 5 that move rapidly over the width of the product stream, thereby examining whether foreign bodies or low-quality products 7 are contained in the product stream. If such a body or product 7 is detected, a signal is passed to said compressed air device 4, which subsequently blows said body or product 7 out of the product stream, by activating one or more compressed air valves 4' at the correct moment. It is therefore important that each of the bodies or products, located opposite the detection system 3 and the compressed air device 4, all follow paths congruent to each other, or at least paths that can be determined beforehand, said paths extending in a direction substantially parallel to the aforementioned surface 1'.
  • the products 7 and 8 should preferably have a constant, or almost constant, speed curve in the zone between the detection system 3 and the removal system 4.
  • a detected foreign body 7 may not be removed, which can result in a low-quality end product.
  • the transport device ensures that the products 7, 8 opposite said detection system 3 and opposite said compressed air device 4 all have a known position and preferably substantially the same speed curve.
  • the downward-sloping surface 1' of the transport device 1 also ensures that the products 7 and 8, which are moved over this device 1, leave said device 1 in a single layer with substantially a thickness of only one product, with a limited distribution.
  • the surface 1' is convex over at least a certain distance in the direction of travel 10 of said products 7 and 8.
  • the surface 1' is preferably curved in a convex manner over the whole length, as shown in the drawings.
  • Said surface 1' has a curvature that approximates as closely as possible to the free falling movement of the products 7 and 8, such that during their downwards movement, said products are guided as much as possible by the surface 1' without the aforementioned dancing movement occurring.
  • the contact pressure between the products 7 and 8 and said surface 1' is reduced by the convex shape, so that there is less braking of the products 7 and 8 due to friction than would be the case with a straight surface.
  • the objective is to ensure that the speed resultant during the downwards movement of the products at each point remains as tangential as possible to the surface 1'.
  • the curvature of the surface 1' in the direction of travel 10 of the products 7 and 8 is therefore equal to, or preferably slightly less than, the path that the products would follow at said surface 1' in free fall, independent of said surface 1'.
  • the transport apparatus 1 of the sorting device according to fig. 1 is shown together with a vibrating table 2.
  • the paths 9 therefore each have a parabolic trajectory, in which each product 7 or 8 has a differently oriented initial speed as a result of the vibrating movement of the vibrating table 2.
  • the surface 1' of the transport device 1 helps to prevent this, since it has a curvature that substantially coincides with, or is smaller than most of the vertically displaced path 9', so that when leaving said surface 1', the products 7 and 8 are forced to form a stream of products with a thickness substantially equal to the thickness of a product 7, 8, with a very small distribution in a direction perpendicular to said surface 1'.
  • said transport device 1 essentially comprises a curved plate with a length L of for example 0.5 m, which at its bottom edge has a horizontal deviation over distance A from the path 9" with the steepest slope.
  • the distance A should preferably be between 5 and 18 cm, and more specifically is substantially 12 cm. This enables contact to be ensured between each product 7, 8 and the surface 1' in a continuous manner during the downwards movement, without a dancing movement being able to occur.
  • the products supplied by the aforementioned vibrating table 2 can each have a different initial speed, in particular as regards orientation, as shown in fig. 2.
  • the surface 1' therefore has to ensure that when these products 7, 8 leave said surface 1', they all have the same, or at least a predetermined, speed and direction of travel 10, and move at a known point through the zone where they are examined by the aforementioned detection system 3, and are possibly removed by the aforementioned compressed air device 4.
  • the surface 1' accordingly has a decreasing curvature in the downwards direction.
  • At least 95% or more specifically at least 99.5% of the products 7, 8 are routed in a substantially continuous way over said surface 1'.
  • the latter comprises well-known means for adjusting the curvature of the surface 1' to match the type of products 7, 8 and the average speed with which said products 7, 8 come in contact with said surface 1'.
  • the curvature can be constantly adjusted so that the products 7, 8 continually touch said surface 1' tangentially during their downwards movement, as already described above.
  • the surface 1' of the transport device 1 consists preferably of a curved plate.
  • Said means comprise adjustable supports for this plate, for example, screw jacks. For the sake of clarity, such means are not shown in the figures.
  • said plate or at least the convex surface 1' of same, is usually manufactured from stainless steel, plastic such as Teflon, polycarbonate, coated steel that has low adhesion and friction with the products to be sorted, as used, among other things, for frying pans of the "Tefal" brand, or other materials.
  • a slightly flexible flap 11 which is mounted around a horizontal axis and which, for example, consists of a piece of rubber, leather or plastic. Said axis is located above the end of the vibrating table 2 that ends at said surface 1' and is perpendicular to the direction of travel 10 of the products 7, 8. In this way, the products 7, 8 moving from the vibrating table 2 to the transport device 1, press against said flap 11 so that the latter is pushed slightly upwards, and lets products through to said surface 1' without them having too high a speed.
  • the flap 11 is not shown in fig. 1.
  • a transport device 1 with a substantially straight surface 1' that has a slope angle in relation to the horizontal of between 50° and 85°, more specifically of the order of 70°.
  • a specific example is given of the shape of a curved surface 1' which can preferably be used in a sorting apparatus for peas and similar products as regards weight, shape and dimensions.
  • a small horizontal acceleration a is imposed to the products by adjusting the curvature of the surface 1' so that the latter is smaller than the curvature of a parabolic falling trajectory.
  • the acceleration a can possibly decrease when the product moves downwards, so that the horizontal acceleration is substantially equal to zero at the lowermost end of said surface.
  • the surface 1' preferably has dimensions and a shape such that the height of fall of the products varies from 0.1 m to 1.2 m, where for example v ox can vary from 0.05 to 0.8 m/s, g from 7 to 10 m/s 2 , a from 0.5 to 6 m/s 3 , and k from 0.1 to 10 m/s 3 . More particularly, a can be between 2 and 4 m/s 2 and k can be between 4 and 6 m/s 2 .
  • the invention is of course not limited to the embodiment of a sorting apparatus equipped with a transport device according to the invention as described above and shown in the accompanying drawings.
  • the upper part of the plate can be flat, and can then gradually assume a convex shape downwards, ending in a short, substantially vertical flat part.
  • the sorting apparatus with the transport device according to the invention is also used for products such as potatoes, carrots, cauliflowers, deep-frozen vegetables or fruit, rice, dried fruits, coffee beans, etc.
  • the vertical distance between the bottom edge and the top edge of the surface 1' can for example vary between 0.1 and 1.2 m, but is preferably between 0.2 and 0.6 m.
  • This relatively limited distance L makes it possible to construct a very compact sorting apparatus in comparison with existing sorting apparatuses, which for example use a conveyor belt.
  • the removal system can comprise another type of device, for example mechanically-operated flaps by means of which foreign bodies or low-quality products can be removed from the stream of products by moving a flap.
  • the aforementioned detection system preferably comprises a laser beam which travels transversely across the product stream, but can also comprise a video camera or suchlike.
  • the aforementioned vibrating table can be replaced by a conveyor belt or another means that enables for the aforementioned products to be brought onto the transport device according to the invention.

Landscapes

  • Sorting Of Articles (AREA)
  • Seasonings (AREA)
  • Polarising Elements (AREA)

Claims (10)

  1. Dispositif de triage pour produits granulaires (7, 8) tels que des pois, des noix, des raisins et analogues, comprenant un dispositif de transport (1) alimenté à partir d'une table vibrante (2), ledit dispositif (1) présentant une surface de distribution inclinée (1') sur laquelle lesdits produits (7, 8) sont déplacés, ladite surface (1') étant suivie par un système de détection (3) et par un système d'enlèvement (4) destinés à éliminer tout corps étranger ou tout produit de mauvaise qualité (7) détecté dans un courant de produits qui quitte ladite surface (1'), caractérisé en ce que ladite surface (1') est complètement lisse, sans aucun canal dans la direction de la chute desdits produits (7, 8) pour guider les produits sur ladite surface (1'), cette dernière présentant dans cette direction une courbure qui est légèrement moins marquée que celle du chemin (9) que les produits suivraient sur ladite surface (1') s'ils tombaient en chute libre, dans lequel les produits suivent des chemins en congruence les uns avec les autres, lesdits chemins s'étendant dans une direction substantiellement parallèle à la surface susmentionnée (1'), d'une manière telle que, à l'extrémité inférieure de ladite surface (1'), les produits occuperont une position connue et auront substantiellement la même courbe de vitesse, et un courant de produits sera formé avec une très petite distribution dans une direction perpendiculaire à ladite surface (1') pendant que le courant de produits quitte la surface en une seule couche présentant substantiellement une épaisseur de seulement un produit, dans lequel ledit système de détection (3) comprend un dispositif destiné à produire au moins un faisceau laser qui se déplace suivant la largeur du courant de produits (7, 8).
  2. Dispositif de triage selon la revendication 1, caractérisé en ce que ladite surface courbe (1') présente une courbure décroissante dans la direction orientée vers le bas.
  3. Dispositif de triage selon la revendication 1 ou 2, caractérisé en ce que ladite surface courbe (1'), dans la direction du déplacement (10) desdits produits (7, 8), présente une longueur comprise entre 0,1 m et 1,2 m, plus spécifiquement entre 0,2 m et 0,6 m, et de préférence égale à 0,4 m.
  4. Dispositif de triage selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ladite surface courbe (1') présente une déviation horizontale comprise de préférence entre 5 cm et 18 cm, plus spécifiquement approximativement égale à 12 cm, par rapport au chemin (9") présentant la pente la plus marquée que lesdits produits (7, 8) suivraient s'ils tombaient en chute libre, indépendamment dudit dispositif de transport (1).
  5. Dispositif de triage selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comprend des moyens pour ajuster ladite surface courbe (1') de manière telle que celle-ci s'adapte au type desdits produits (7, 8).
  6. Dispositif de triage selon la revendication 5, caractérisé en ce que lesdits moyens comprennent des supports réglables pour la plaque.
  7. Dispositif de triage selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ladite surface (1') est une plaque courbe.
  8. Dispositif de triage pour produits granulaires collants (7, 8), tels que certaines sortes de raisins et analogues, comprenant un système de détection (3), un système d'enlèvement (4) et un dispositif de transport (1), dans lequel ce dernier présente une surface de distribution inclinée (1') sur laquelle lesdits produits (7, 8) sont déplacés et par laquelle lesdits produits sont guidés, dans lequel cette surface (1') est suivie par ledit système de détection (3) et par ledit système d'enlèvement (4), caractérisé en ce que ladite surface (1') est complètement lisse, sans aucun canal dans la direction de la chute desdits produits (7, 8) pour guider les produits sur ladite surface (1'), cette dernière étant droite et présentant un angle d'inclinaison qui est compris entre 50° et 85°, plus spécifiquement de l'ordre de 70°, dans lequel les produits suivent des chemins en congruence les uns avec les autres, lesdits chemins d'étendant dans une direction substantiellement parallèle à la surface susmentionnée (1'), d'une manière telle que, à l'extrémité inférieure de ladite surface (1'), les produits occuperont une position connue et auront substantiellement la même courbe de vitesse, et un courant de produits sera formé avec une très petite distribution dans une direction perpendiculaire à ladite surface (1') pendant que le courant de produits quitte la surface en une seule couche présentant substantiellement une épaisseur de seulement un produit, dans lequel ledit système de détection (3) comprend un dispositif destiné à produire au moins un faisceau laser qui se déplace suivant la largeur du courant de produits (7, 8) et peut éventuellement interagir avec un dispositif de référence (6).
  9. Dispositif de triage selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'un volet de préférence flexible (11) est monté sur un axe horizontal de telle sorte que les produits (7, 8) à trier soit acheminés à travers ledit volet (11) jusqu'à la surface (1') du dispositif de transport (1), ledit volet (11) étant de préférence constitué de caoutchouc, de cuir ou de plastique.
  10. Dispositif de triage selon l'une quelconque des revendications 1 à 9, caractérisé en ce que ladite surface (1') est constituée d'acier, d'acier inoxydable ou d'un acier revêtu présentant une friction et une adhérence très faibles avec les produits à trier, comme par exemple celui utilisé pour les poêles à frire de marque "Téfal", ou d'un plastique tel que le Téflon, le polycarbonate, etc.
EP98900483A 1997-01-17 1998-01-15 Dispositif de triage Expired - Lifetime EP0952895B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
BE9700055 1997-01-17
BE9700055A BE1010682A3 (nl) 1997-01-17 1997-01-17 Sorteerapparaat.
PCT/BE1998/000005 WO1998031477A1 (fr) 1997-01-17 1998-01-15 Dispositif de triage

Publications (2)

Publication Number Publication Date
EP0952895A1 EP0952895A1 (fr) 1999-11-03
EP0952895B1 true EP0952895B1 (fr) 2004-03-31

Family

ID=3890282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98900483A Expired - Lifetime EP0952895B1 (fr) 1997-01-17 1998-01-15 Dispositif de triage

Country Status (8)

Country Link
US (1) US6305551B1 (fr)
EP (1) EP0952895B1 (fr)
AT (1) ATE262984T1 (fr)
AU (1) AU5544298A (fr)
BE (1) BE1010682A3 (fr)
DE (1) DE69822788T2 (fr)
ES (1) ES2218798T3 (fr)
WO (1) WO1998031477A1 (fr)

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US7557922B2 (en) 2005-05-17 2009-07-07 Visys Nv Detection system for use in a sorting apparatus, a method for determining drift in the detection system and a sorting apparatus comprising such detection system

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EP1726372B1 (fr) 2005-05-17 2011-07-13 Visys NV Appareil de tri pourvu d'une goulotte
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ES2456315T3 (es) * 2007-09-03 2014-04-22 Tomra Sorting Nv Dispositivo de clasificación con una fuente de radiación supercontinua y un método asociado
BE1018766A3 (nl) 2009-06-02 2011-08-02 Best 2 N V Sorteerapparaat met een verwijderinrichting.
US8546704B1 (en) * 2010-06-16 2013-10-01 Maurice Minardi Precise count high volume preform delivery system
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CN102755967A (zh) * 2011-04-28 2012-10-31 合肥泰禾光电科技股份有限公司 一种色选机滑道
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WO2015158962A1 (fr) * 2014-04-17 2015-10-22 Zenrobotics Oy Unité de tri de matériel, un système et un procédé de tri de matériel
US10345789B2 (en) 2016-06-21 2019-07-09 Scientific Games International, Inc. System and method for variable perforation profiles in a stack of lottery tickets
WO2019011809A1 (fr) * 2017-07-10 2019-01-17 Arlanxeo Deutschland Gmbh Appareil d'inspection et procédé d'inspection visuelle de particules élastiques
BE1026632B1 (nl) 2018-09-18 2020-04-16 Optimum Nv Sorteerapparaat
EP3659719B1 (fr) * 2018-11-30 2023-01-18 Körber Supply Chain Logistics GmbH Dispositif de tri pour marchandises de détail à une pluralité de postes cibles
BE1030373B1 (nl) 2022-03-21 2023-10-17 Optimum N V Sorteerapparaat met een afgeschermde detectie-inrichting

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Publication number Priority date Publication date Assignee Title
US7557922B2 (en) 2005-05-17 2009-07-07 Visys Nv Detection system for use in a sorting apparatus, a method for determining drift in the detection system and a sorting apparatus comprising such detection system

Also Published As

Publication number Publication date
DE69822788D1 (de) 2004-05-06
AU5544298A (en) 1998-08-07
DE69822788T2 (de) 2005-03-10
ES2218798T3 (es) 2004-11-16
BE1010682A3 (nl) 1998-11-03
US6305551B1 (en) 2001-10-23
EP0952895A1 (fr) 1999-11-03
ATE262984T1 (de) 2004-04-15
WO1998031477A1 (fr) 1998-07-23

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